Apple Security Update 2015-002 is recommended for all users and improves the security of OS X. For detailed information about the security content of this update, please visit: http://support.apple.com/kb/ht1222

Security Update 2015-002 for OS X 10.10 Yosemite
Security Update 2015-002 for OS X 10.9 Mavericks
Security Update 2015-002 for OS X 10.8 Mountain Lion